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new 4822100 Updated commands and instructions in Classpath Example (#132)
4822100 is described below
commit 4822100cdedaa4fe544b991f3a527477d64f6440
Author: Amanda Villarreal <[email protected]>
AuthorDate: Fri Jun 5 11:46:11 2026 -0500
Updated commands and instructions in Classpath Example (#132)
---
docs/classpath.md | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff --git a/docs/classpath.md b/docs/classpath.md
index e12df09..2b43d7c 100644
--- a/docs/classpath.md
+++ b/docs/classpath.md
@@ -18,31 +18,18 @@ limitations under the License.
This example shows how to use per table classpaths. The example leverages a
test jar which contains a Filter that suppresses rows containing "foo". The
-example shows copying the FooFilter.jar into HDFS and then making an Accumulo
-table reference that jar. For this example, a directory, `/user1/lib`, is
-assumed to exist in HDFS.
-
-Create `/user1/lib` in HDFS if it does not exist.
-
- hadoop fs -mkdir -p /user1/lib
-
-Execute the following command in the shell. Note that the `FooFilter.jar`
-is located within the Accumulo source distribution.
-
- $ hadoop fs -copyFromLocal
/path/to/accumulo/test/src/main/resources/org/apache/accumulo/test/FooFilter.jar
/user1/lib
-
-Execute following in Accumulo shell to setup classpath context
-
- root@uno> config -s general.vfs.context.classpath.cx1=hdfs://<namenode
host>:<namenode port>/user1/lib/[^.].*.jar
+example shows configuring a table to load classes from the jar using the
+URL-based context class loader. Note that the `FooFilter.jar` is located within
+the Accumulo source distribution.
Create a namespace and table
root@uno> createnamespace examples
root@uno> createtable examples.nofoo
-The following command makes this table use the configured classpath context
+The following command configures the table to load classes from the jar URL.
- root@uno examples.nofoo> config -t examples.nofoo -s
table.class.loader.context=cx1
+ root@uno examples.nofoo> config -t examples.nofoo -s
table.class.loader.context=file:///path/to/accumulo/test/src/main/resources/org/apache/accumulo/test/FooFilter.jar
The following command configures an iterator that's in FooFilter.jar
@@ -59,16 +46,15 @@ The commands below show the filter is working.
root@uno examples.nofoo>
Below, an attempt is made to add the FooFilter to a table that's not configured
-to use the classpath context cx1. This fails until the table is configured to
-use cx1.
+to load classes from the jar URL. This fails until the table is configured with
+the jar URL.
root@uno examples.nofoo> createtable examples.nofootwo
root@uno examples.nofootwo> setiter -n foofilter -p 10 -scan -minc -majc
-class org.apache.accumulo.test.FooFilter
2013-05-03 12:49:35,943 [shell.Shell] ERROR:
org.apache.accumulo.shell.ShellCommandException: Command could
not be initialized (Unable to load org.apache.accumulo.test.FooFilter;
class not found.)
- root@uno examples.nofootwo> config -t examples.nofootwo -s
table.class.loader.context=cx1
+ root@uno examples.nofootwo> config -t examples.nofootwo -s
table.class.loader.context=file:///path/to/accumulo/test/src/main/resources/org/apache/accumulo/test/FooFilter.jar
root@uno examples.nofootwo> setiter -n foofilter -p 10 -scan -minc -majc
-class org.apache.accumulo.test.FooFilter
Filter accepts or rejects each Key/Value pair
----------> set FooFilter parameter negate, default false keeps k/v that
pass accept method, true rejects k/v that pass accept method: false
-
